FAG 6304-2RSR-C3 20x52x15 Deep Groove Ball Bearing

FAG 6304-2RSR-C3 is a single-row deep groove ball bearing with principal dimensions of 20x52x15 mm. The bore diameter d is 20 mm, outside diameter D is 52 mm and width B is 15 mm. This exact variant incorporates contact seals on both sides, designated 2RSR, and C3 radial internal clearance greater than Normal.

FAG 6304-2RSR-C3 - Product Characteristics

The exact manufacturer designation 6304-2RSR-C3 identifies a specific FAG configuration within the 6304 bearing family.

Its single row of balls operates in deep raceway grooves in the inner and outer rings. This geometry is primarily designed for radial loads while also allowing axial loads to be accommodated in both directions.

Two features are particularly important for identifying this exact product:

2RSR - contact seals on both sides.

C3 - radial internal clearance greater than Normal.

These suffixes distinguish this bearing from open, shielded and Normal-clearance 6304 variants.

Dimensions

The principal dimensions of FAG 6304-2RSR-C3 are:

d - Bore Diameter: 20 mm
D - Outside Diameter: 52 mm
B - Width: 15 mm
Dimensions: 20x52x15 mm.

For this bearing, the dimensional notation 20x52x15 mm corresponds to d x D x B.

The bearing has a cylindrical bore.

Bearing Construction

FAG 6304-2RSR-C3 is a single-row, non-separable deep groove ball bearing.

Its construction consists principally of an inner ring, outer ring, balls and cage. The balls run in deep raceway grooves, allowing the bearing to support radial loads and axial loads acting in either direction.

The exact reference is manufactured with seals on both sides, meaning the rolling contact system and grease filling are enclosed within the bearing.

This configuration should therefore be distinguished from open 6304 and shielded 6304-2Z variants even where the principal dimensions are identical.

2RSR Contact Seals

The suffix 2RSR identifies the sealing arrangement.

For FAG bearings, 2RSR indicates contact seals on both sides of the bearing. This configuration is intended to retain lubricant inside the bearing while providing protection against contamination entering from the surrounding environment.

Because the seals make contact with their mating surfaces, this design differs from non-contact metal shields.

Consequently, 6304-2RSR-C3 should not be reduced to the generic designation "6304 2RS" when precise technical identification is required.

C3 Radial Internal Clearance

The suffix C3 means that the bearing has radial internal clearance greater than Normal.

C3 is an integral part of the exact product specification. It should not be omitted when ordering or comparing the bearing.

Greater-than-Normal initial clearance may be required where operating conditions reduce internal clearance after mounting, for example because of interference fits or temperature differences between the bearing rings. However, the presence of C3 does not mean that this bearing is automatically suitable for every high-temperature or high-speed application.

The required internal clearance must be determined from the actual bearing arrangement and operating conditions.

Loads and Operating Principle

The deep groove geometry makes FAG 6304-2RSR-C3 primarily suitable for radial loading.

The bearing can also accommodate axial loads in both directions, which allows one bearing to provide axial location in either direction within the limits established by the bearing arrangement and operating conditions.

Schaeffler catalogue data specify:

Cr - Basic Dynamic Radial Load Rating: 16.9 kN
C0r - Basic Static Radial Load Rating: 7.9 kN.

These are engineering calculation values and should not be interpreted as simple universal maximum permissible loads.

Fatigue Load Limit

Available catalogue data for the exact 6304-2RSR-C3 reference specify:

Cur - Fatigue Load Limit: 0.53 kN.

The fatigue load limit is used in bearing life calculations and should not be confused with the basic dynamic load rating Cr or basic static load rating C0r.

Limiting Speed

For FAG 6304-2RSR-C3, Schaeffler data specify:

nG - Limiting Speed: 8,800 r/min.

The actual permissible operating speed in a machine can be lower and depends on factors including load, fits, lubrication, operating temperature and heat dissipation.

The presence of contact seals is particularly relevant when comparing speed capability with open or shielded versions of the same bearing size.

Meaning of 6304-2RSR-C3

The complete designation should be retained:

6304-2RSR-C3

Its principal elements identify:

6304 - deep groove ball bearing of the 63 dimensional series with a 20 mm bore.

2RSR - contact seals on both sides.

C3 - radial internal clearance greater than Normal.

This means that 6304, 6304-2RSR and 6304-2RSR-C3 are not identical product configurations even though their principal dimensions can all be 20x52x15 mm.

6304-2RSR-C3 vs 6304-2RSR

The principal difference is radial internal clearance.

6304-2RSR has the same basic sealed construction but does not carry the C3 suffix.

6304-2RSR-C3 specifically identifies the version with C3 clearance greater than Normal.

The C3 suffix should therefore never be removed merely to simplify the product name for SEO purposes.

6304-2RSR-C3 vs 6304-2Z

These versions differ in closure design.

6304-2RSR-C3 uses contact seals on both sides.

A 6304-2Z configuration uses metal shields.

Although the principal dimensions may be the same, the closure design affects contamination protection, lubricant retention, friction and permissible operating conditions.

Selection and Interchangeability

When selecting an alternative to FAG 6304-2RSR-C3, matching the 20x52x15 mm dimensions alone is insufficient.

The replacement should be checked for bearing type, d = 20 mm, D = 52 mm, B = 15 mm, contact sealing on both sides, C3 internal clearance, load ratings, speed capability, cage design, tolerance requirements and operating conditions.

Other manufacturers use suffixes such as 2RS1, 2RSH, DDU, LLU or 2RS for their sealing systems. Similar terminology does not automatically establish technical equivalence with FAG 2RSR.

Technical Specification

Manufacturer / Brand: FAG
Manufacturer Group: Schaeffler
Designation: 6304-2RSR-C3
Product Type: Deep groove ball bearing
Bearing Type: Single-row deep groove ball bearing
Number of Rows: 1
Dimensions: 20x52x15 mm
d - Bore Diameter: 20 mm
D - Outside Diameter: 52 mm
B - Width: 15 mm
Bore: Cylindrical
Sealing: Contact seals on both sides
Seal Suffix: 2RSR
Radial Internal Clearance: C3, greater than Normal
Cage: Sheet steel
Cr - Basic Dynamic Radial Load Rating: 16.9 kN
C0r - Basic Static Radial Load Rating: 7.9 kN
Cur - Fatigue Load Limit: 0.53 kN
nG - Limiting Speed: 8,800 r/min
Mass: approximately 0.143 kg
EAN: 4012801562997.

FAQ

What are the dimensions of FAG 6304-2RSR-C3?

The dimensions are 20x52x15 mm: d = 20 mm, D = 52 mm and B = 15 mm.

What type of bearing is FAG 6304-2RSR-C3?

It is a single-row deep groove ball bearing with contact seals on both sides and C3 radial internal clearance.

What does 2RSR mean?

2RSR means that contact seals are fitted on both sides of the bearing.

What does C3 mean?

C3 indicates radial internal clearance greater than Normal. It is an important part of the exact bearing specification.

What loads can FAG 6304-2RSR-C3 accommodate?

Its deep groove ball bearing construction primarily accommodates radial loads and can also carry axial loads in both directions.

What are the load ratings of FAG 6304-2RSR-C3?

The basic dynamic radial load rating Cr is 16.9 kN, while the basic static radial load rating C0r is 7.9 kN.

What is the limiting speed of FAG 6304-2RSR-C3?

The specified limiting speed nG is 8,800 r/min. Actual permissible operating speed depends on the complete bearing arrangement and operating conditions.

Can another manufacturer's 6304 2RS C3 replace this bearing?

Potentially, but not based on dimensions alone. Seal design, C3 clearance, load ratings, speed capability, cage, tolerances and application requirements should be compared before confirming interchangeability.

AI Overview

FAG 6304-2RSR-C3 is a single-row deep groove ball bearing measuring 20x52x15 mm, with contact seals on both sides and C3 radial internal clearance greater than Normal. Schaeffler specifies a basic dynamic radial load rating Cr of 16.9 kN, static rating C0r of 7.9 kN and limiting speed of 8,800 r/min.